Filed by Baker Hughes Incorporated
Pursuant to Rule 425 of the Securities Act of 1933, as amended, and
deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934, as amended
Subject Company: BJ Services Company
Commission File No: 001-10570

In connection with the proposed merger, Baker Hughes Incorporated (Baker Hughes) will file with
the Securities and Exchange Commission (the SEC) a Registration Statement on Form S-4 that will
include a joint proxy statement of Baker Hughes and BJ Services Company (BJ Services) that also
will constitute a prospectus of Baker Hughes regarding the proposed transaction. INVESTORS AND
SECURITY HOLDERS OF BAKER HUGHES AND BJ SERVICES ARE URGED TO CAREFULLY READ THE JOINT PROXY
STATEMENT/PROSPECTUS WHEN IT BECOMES AVAILABLE BECAUSE IT WILL CONTAIN IMPORTANT INFORMATION
REGARDING BAKER HUGHES, BJ SERVICES AND THE PROPOSED TRANSACTION. A definitive joint proxy
statement/prospectus will be sent to security holders of Baker Hughes and BJ Services seeking their
approval of the proposed transaction. Investors and security holders may obtain a free copy of the
proxy statement/prospectus (when available) and other documents filed by Baker Hughes and BJ
Services with the SEC at the SECs web site at www.sec.gov.

The joint proxy statement/prospectus and such other documents (relating to Baker Hughes) may also
be obtained from Baker Hughes for free (when available) from Baker Hughes web site at
www.bakerhughes.com/investor or by directing a request to: Baker Hughes Incorporated, 2929 Allen
Parkway, Suite 2100, Houston, TX 77019, Attention: Corporate Secretary, or by phone at (713)
439-8600. The joint proxy statement/prospectus and such other documents (relating to BJ Services)
may also be obtained from BJ Services for free (when available) from BJ Services web site at
www.bjservices.com or by directing a request to: BJ Services Company, P.O. Box 4442, Houston, Texas
77210-4442, Attention: Investor Relations, or by phone at (713) 462-4239.

Baker Hughes, its directors, executive officers and certain members of management and employees may
be considered participants in the solicitation of proxies from Baker Hughes stockholders in
connection with the proposed transaction. Information regarding such persons and a description of
their interests in the proposed transaction will be contained in the joint proxy
statement/prospectus when it is filed with the SEC.

BJ Services, its directors, executive officers and certain members of management and employees may
be considered participants in the solicitation of proxies from BJ Services stockholders in
connection with the proposed transaction. Information regarding such persons and a description of
their interests in the proposed transaction will be contained in the joint proxy
statement/prospectus when it is filed with the SEC.

Except for the historical information set forth in this document, the matters discussed in this
document are forward-looking statements that involve certain assumptions and known and unknown
risks, uncertainties and other factors that could cause our actual results to differ materially.
Such forward-looking statements include, but are not limited to, statements about the benefits of
the business combination transaction involving Baker Hughes and BJ Services, including expected
future financial and operating results, anticipated accretion to Baker Hughes earnings per share
arising from the transaction, the expected amount and timing of cost savings and operating
synergies, whether and when the transactions contemplated by the merger agreement will be
consummated, the new combined companys plans, market and other expectations, objectives,
intentions and other statements that are not historical facts.

The following additional factors, among others, could cause actual results to differ from those set
forth in the forward-looking statements: the ability to obtain regulatory approvals for the
transaction and the approval of the merger agreement by the stockholders of both parties; the risk
that the cost savings and any other synergies from the transaction may not be realized or take
longer to realize than expected; disruption from the transaction making it more difficult to
maintain relationships with customers, employees or suppliers; the ability to successfully
integrate the businesses; unexpected costs or unexpected liabilities that may arise from the
transaction, whether or not consummated; the inability to retain key personnel; continuation or
deterioration of current market conditions; future regulatory or legislative actions that could
adversely affect the companies; and the business plans of the customers of the respective parties.
Additional factors that may affect future results are contained in Baker Hughes and BJ Services
filings with the SEC, which are available at the SECs web site http://www.sec.gov. Except as
required by law, neither Baker Hughes nor BJ Services intends to update or revise statements contained in these materials based on new
information, future events or otherwise.

Contacts for Baker Hughes

Contacts for BJ Services

Gary Flaharty +1.713.439.8039

Jeff Smith +1.713.462.4239

H. Gene Shiels +1.713 439.8822

Baker Hughes to Acquire BJ Services in $5.5 Billion Transaction

Combines BJ Services Leading Pressure Pumping Business with Baker Hughes Diversified
International Franchise

Allows Combined Company to More Effectively Compete for Integrated Projects and Accelerate
International Growth

Cost Synergies of $75 Million in 2010 and $150 Million in 2011

Houston, Texas (August 31, 2009)  Baker Hughes Incorporated [NYSE: BHI] and BJ Services Company
[NYSE: BJS] today announced that their Boards of Directors have approved a definitive merger
agreement, which represents a transaction value of $5.5 billion for BJ Services based on closing
stock prices on August 28, 2009.

The agreement represents a premium to BJ Services stockholders of 16.3% over the closing price of
BJ Services stock on August 28, 2009. Under the agreement, BJ Services stockholders will receive
0.40035 shares of Baker Hughes and cash of $2.69 in exchange for each share of BJ Services common
stock. Upon closing, and reflecting the issuance of new Baker Hughes shares, BJ Services
stockholders collectively will own approximately 27.5% of Baker Hughes outstanding shares.

The transaction further enhances Baker Hughes position as a top-tier global oilfield services
company, said Chad C. Deaton, Baker Hughes chairman, president and chief executive officer. BJ
Services broadens our portfolio by adding products, technologies and talented people that are key
to helping our customers unlock value in their reservoirs, particularly in unconventional gas and
deepwater fields. It will better position

us to drive international growth and to compete for the growing large integrated projects by
incorporating pressure pumping into our product offering.

Our two companies have highly complementary products and services with very little overlap. Baker
Hughes has a long record of partnering with BJ Services on major projects. The proposed merger
will make Baker Hughes a stronger, more efficient service provider for our customers worldwide, by
integrating pressure pumping with Baker Hughes wide range of products and services.

Baker Hughes expects to realize annual cost savings of approximately $75 million in 2010 and $150
million in 2011 as it eliminates redundant costs, consolidates facilities, and further rationalizes
field costs. Baker Hughes expects the combination to be accretive to earnings per share in 2011.

The Baker Hughes Board of Directors will be expanded to include two BJ Services Board members.

BJ Services Chairman, President and CEO Bill Stewart said: We are very pleased to be joining
forces with Baker Hughes and believe that this is an attractive combination for all of BJ Services
constituencies: customers will benefit from our wider and better-integrated array of services and
technologies; our employees will enjoy the advantages and opportunities of being a part of a
larger, stronger company; and BJ Services stockholders will have the opportunity to continue to
participate in the success of the combined enterprise.

Although pressure pumping accounted for less than 1% of Baker Hughes revenues in 2008, it is
expected to generate approximately 20% of the combined companys revenues, providing Baker Hughes
with revenues from pressure pumping that approaches its two largest competitors. Pressure pumping
has grown in importance as customers have looked for new ways to unlock the full value of their
reservoirs. The number of fields requiring pressure pumping services is expected to grow,
especially outside of North America, where BJ Services can leverage Baker Hughes extensive
international presence as it pursues growth opportunities.

The merger is subject to the approval of both Baker Hughes and BJ Services stockholders as well
as other customary approvals. The companies anticipate that the transaction could close as soon as
the end of the calendar year. Baker Hughes and BJ Services intend to file a joint proxy statement
/ prospectus with the Securities and Exchange Commission as soon as possible.

Baker Hughes and BJ Services have scheduled a joint conference call today to discuss the merger.
The call will begin at 8:30 a.m. Eastern time, 7:30 a.m. Central time, on August 31, 2009. To
access the call, which is open to the public, please contact the conference call operator at (877)
382-1760, or (706) 758-8296 for international callers, 20 minutes prior to the scheduled start
time, and ask for the Baker Hughes and BJ Services Conference Call. A replay will be available
through, September 28, 2009. The number for the replay is (800) 642-1687, or (706) 645-9291 for
international callers. The call and replay will also be web cast on www.bakerhughes.com and on
www.bjservices.com. Todays news release, along with other news about Baker Hughes and BJ
Services, is available on the Internet at www.bakerhughes.com/investor
in the News and Events
section under Events and Presentations ; www.bjservices.com
in the Investors section; and
www.premieroilservice.com.

Forward-Looking Statements

Information set forth in this document (and all oral statements made regarding the subjects of this
document, including on the conference call announced herein) contain forward-looking statements
(as defined in Section 21E of the Securities Exchange Act

of 1934, as amended), which reflect Baker Hughes and BJ Services expectations regarding future
events. The forward-looking statements involve a number of risks, uncertainties and other factors
that could cause actual results to differ materially from those contained in the forward-looking
statements. Such forward-looking statements include, but are not limited to, statements about the
benefits of the business combination transaction involving Baker Hughes and BJ Services, including
future financial and operating results, accretion to Baker Hughes earnings per share arising from
the transaction, the expected amount and timing of cost savings and operating synergies, whether
and when the transactions contemplated by the merger agreement will be consummated, the new
combined companys plans, market and other expectations, objectives, intentions and other
statements that are not historical facts.

The following additional factors, among others, could cause actual results to differ from those set
forth in the forward-looking statements: the ability to obtain regulatory approvals for the
transaction and the approval of the merger agreement by the stockholders of both parties; the risk
that the cost savings and any other synergies from the transaction may not be realized or may take
longer to realize than expected; disruption from the transaction making it more difficult to
maintain relationships with customers, employees or suppliers; the ability to successfully
integrate the businesses, unexpected costs or unexpected liabilities that may arise from the
transaction, whether or not consummated; the inability to retain key personnel; continuation or
deterioration of current market conditions; future regulatory or legislative actions that could
adversely affect the companies; and the business plans of the customers of the respective parties.
Additional factors that may affect future results are contained in Baker Hughes and BJ Services
filings with the Securities and Exchange Commission (SEC), which are available at the SECs web
site http://www.sec.gov. Baker Hughes and BJ Services disclaim any obligation to update and revise
statements contained in these materials based on new information or otherwise.

Additional Information and Where to Find It

Baker Hughes and BJ Services will file a joint proxy statement/prospectus and other documents with
the SEC. INVESTORS AND SECURITY HOLDERS ARE URGED TO CAREFULLY READ THE JOINT PROXY
STATEMENT/PROSPECTUS WHEN IT BECOMES AVAILABLE, BECAUSE IT WILL CONTAIN IMPORTANT INFORMATION
REGARDING BAKER HUGHES, BJ SERVICES AND THE ACQUISITION. A definitive joint proxy
statement/prospectus will be sent to security holders of Baker Hughes and BJ Services seeking their
approval of the acquisition. Investors and security holders may obtain a free copy of the proxy
statement/prospectus (when available) and other documents filed by Baker Hughes and BJ Services
with the SEC at the SECs web site at www.sec.gov. The proxy statement/prospectus and such other
documents (relating to Baker Hughes) may also be obtained for free from Baker Hughes by accessing
Baker

Hughes website at www.bakerhughes.com/investor. The proxy statement/prospectus and such other
documents (relating to BJ Services) may also be obtained for free from BJ Services by accessing BJ
Services website at www.bjservices.com.

Participants in the Solicitation

Baker Hughes, its directors, executive officers and certain members of management and employees may
be considered participants in the solicitation of proxies from Baker Hughes stockholders in
connection with the acquisition. Information regarding such persons and a description of their
interests in the acquisition will be contained in the joint proxy statement/prospectus when it is
filed.

BJ Services, its directors, executive officers and certain members of management and employees may
be considered participants in the solicitation of proxies from BJ Services stockholders in
connection with the acquisition. Information regarding such persons and a description of their
interests in the acquisition will be contained in the joint proxy statement/prospectus when it is
filed.

BJ Services Company is a leading provider of pressure pumping, well completion, production
enhancement and pipeline services to the petroleum industry.